Improvement in perspective-drawing apparatus



c. DIEHL. Perspective-Drawing Apparatus.

NO.|56,209. I Patented Oct .27-,I874.

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UNITED STATES PATENT OFFICE.

OONRADDIEHL, OF ST. LOUIS, MISSOURI.

IMPROVEMENT IN PERSPECTIVE-DRAWING APPARATUS.

Specification forming part of Letters Patent No.156,209, dated October27, 1874; application filed March 25, 1874.

To all whom it may concern:

Be it known that I, CONRAD DIEHL, of the city and county of St. LouisandState of Missouri, have invented an Apparatus embodying theprinciples of Object-Drawing, of which the following is a specification:

It is the object of my apparatus to illustrate the task of reproducingthe impression which the eye receives of real objects upon a plane.

A in the annexed drawing represents a horizontal plane, tablet, or othersupport, upon which the object to be drawn is placed. On the edge ofthis table is vertically erected the frame 0 G, to which a net, of equalsquares, B, is fastened, representing the picture-sur- This net of linesmay be constructed of cords or wires, or may be engraved upon'a glassplate, which is slid into the frame. A number of squares, equal to thosethrough which the object is seen from a fixed point of View, beingtraced on the drawing-paper, the student is enabled to inscribe theboundinglines and details of an object into the squares on the paper asthey appear inscribed in the squares of the apparatus. A set-screw, D,working against a cleat, E, or some other suitable 'contrivance, isattached to the support A for the purpose of fastening the same to adesk or drawing-table.

The principal advantage of my invention consists in its application foruse in schools,

as it exercises the eye of the pupil and im-'

